| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Prunus persica | Fruit | 170.0 | 1377.0 | 0.5 | * |
| Prunus domestica | Fruit | 60.0 | 405.0 | -0.7 | USDA's Ag Handbook 8 and sequelae) |
| Psidium guajava | Plant | 50.0 | 360.0 | -0.8 | * |
| Psidium cattleianum | Fruit | 40.0 | 205.0 | -0.9 | * |
| Psophocarpus tetragonolobus | Tuber | 1430.0 | 3357.0 | 1.7 | * |
| Psophocarpus tetragonolobus | Seed | 3560.0 | 3884.0 | -0.1 | * |
| Psophocarpus tetragonolobus | Leaf | 640.0 | 2765.0 | -0.3 | * |
| Psoralea esculenta | Root | -- | 253.0 | -1.4 | Izadoost, M. & Robinson, T., Synergism & antagonism in the pharmacology of alkaloidal plants, pp 137-58 in Craker, L. & Simon, J., eds., Herbs, Spices & Medicinal Plants: Recent Advances in Botany, Horticulture & Pharmacology, v. 2, 1987, 255pp. |
| Punica granatum | Fruit | -- | -- | * | |
| Pyrus communis | Fruit | 50.0 | 309.0 | -0.8 | * |
| Raphanus sativus | Root | 70.0 | 1355.0 | 0.5 | * |
| Rehmannia glutinosa | Root | -- | 1000.0 | -0.1 | * |
| Rosmarinus officinalis | Leaf | 470.0 | 1460.0 | -1.4 | USDA's Ag Handbook 8 and sequelae) |
| Sambucus canadensis | Fruit | 140.0 | 693.0 | -0.3 | USDA's Ag Handbook 8 and sequelae) |
| Scutellaria baicalensis | Root | -- | -- | * | |
| Secale cereale | Seed | 2480.0 | 2785.0 | -0.4 | USDA's Ag Handbook 8 and sequelae) |
| Sechium edule | Fruit | 10.0 | 145.0 | -1.0 | * |
| Senna obtusifolia | Seed | -- | 2270.0 | -0.5 | * |
| Sesamum indicum | Seed | 3120.0 | 9413.0 | 1.3 | * |
| Sinapis alba | Seed | 4800.0 | 5136.0 | 0.2 | * |